Flue.



. CAMPFIELD.

FLUE.

APPLiCATION FILED JAN. 9

W Patented Dec. 26,1916.

2 SHEETSSHEET l.

Inventor Attorneys Witnesses n4: NCRRIS PETERS c0-. WASHINGTON, D. c.

E. M. CAMPHELD.

FLUE.

APPLICATION FILED JAN-$1914. 1,2 9,93%. Patented Dec.26,1916

2 SHEET$SHEET 2- a; Z; & 49'

Actorneys r: NORRIS PETERS C0,, WASHINGTON, D. r.

e. S e n TINTT EDWIN M. GAMPFIELD, OF RICHMOND, INDIANA.

FLUE.

Specification of Letters Patent.

Patented Dec. 26, 1916.

Application filed January 9, 1914. Serial No. 811,226.

To all whom it may concern:

Be it known that I, EDWIN M. CAMPFIELD, a citizen of the United States,residing at Richmond, in the county of Wayne and State of Indiana, haveinvented a new and useful Flue, of which the following is a,specification.

This invention relates to flues for use in the construction of chimneysand the like, the principal object of the invention being to provide afine made up of blocks having air cells therein whereby overheating ofthe outer surface of the flueis prevented.

A further object is to provide means whereby the cells in each sectionof the flue are closed at their ends so that dead air spaces are thusproduced.

A further object is to provide a flue made up of sections held togetherin a novel man ner. these sections being readily assembled.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, can be made with in thescope of what is claimed, without departing from the spirit of theinvention.

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings, Figure 1 is a vertical section through the meetingportions of the sections of a flue. embodying the present improvements.Fig. 2 is a section on line AB Fig. 1. Fig. 3 is a view similar to Fig.2 but showing a modified form of flue. Fig. 4 is a transverse sectionthrough another form of flue. Figs. 5, 6 and 7 are transverse sectionsthrough other modified forms of flues.

Referring to the figures by characters of reference 1 designates cornerblocks or sections of a flue, each section being made up of concrete orother plastic material and being provided with longitudinal openings 2.The longitudinal edges of the sections are provided with grooves 3 whichincrease in width inwardly, these grooves in the various sections beingadapted to register when the sections are assembled, after which thegrooves can be filled with cement or other suitable material asindicated at 4 so as thus to form a key which will hold the sectionstogether securely.

In the structure shown in Fig. 2, the flue section is made up offour'similar sections. If desired, however, and as shown in Fig. 3, sidesections 5 may be interposed between the corner sections and thesesections 5 can be provided with grooves 6 in their inner faces adaptedto register with corresponding grooves 7 formed in the ends of apartition 8. A filling 9 of cement or other plastic material can beplaced in the registering grooves so as to thus key the partition 8 tothe side sections 5. The side sections 5 are similarly connected to thecorner sections. The side sections as well as the partition are bothformed with longitudinal air spaces or passages as shown at 10. In astructure of this type two flues are provided. Instead of making thepartition 8 a piece which is separate from the side walls, a partition11 can be made integral with a rectangular one-piece flue 12, as shownin Fig. 4 and a U-shaped flue section 13 can then be placed against theflue 12 and secured thereto by means of keys 14 made up of plasticmaterial poured into registering grooves 15 formed in the sections.Another form of flue has been shown in Fig. 5 wherein a section 16similar to the section 12 is used in connection with a section 17similar to the section 13. Interposed between these two sections is aU-shaped section 18 and all of the sections are held together by keysmade up of plastic material placed within registering grooves 19 formedin the sections.

In Fig. 6 a flue formed in a single piece has been shown, said fluebeing substantially rectangular while in Fig. 7 a cylindrical one pieceflue has been shown.

It will be noted that in all of the structures illustrated, air spacesare formed in the walls thereof, these air spaces being extendedthroughout the length of the sections.

As shown in Fig. 1, the ends of the sections may be cut off straight anda ring 23 of cement or other suitable material can be interposed betweenthe sections, there being washers 2 of asbestos or the like placed uponthe opposed faces of the ring 23. Furthermore the said ring can havelugs 25 ex tending upwardly and downwardly therefrom and into certain ofthe air cells so as to prevent lateral shifting of one section relativeto the other.

It has been found that a fine when constructed as herein described, canbe readily set up and Will operate positively to prevent overheating andconsequent danger of fire loss.

It is the practice in the construction of fines to utilize a singlethickness of fire clay with mortar joints. It has been found that thesejoints are not always properly made and, as the-mortar is not --formedoffire clay it will not stand the heat to Which it is sub jected and,consequently, the connections be-' tween: the'sections of the flue oftenbecome broken, this resulting; in fires.

By constructing a flue such as herein described, the air cells or deadair spaces prevent to-a very'large extent, the heating of the outersurfaces of the flue and maintain the inner surfaces-of the flue Warm sothat the danger of fires is not only eliminated but a better draftthrough the flue results.

hat is claimed is A chimney flue formed of sections of plastic material,each section being made up of separate members having longitudinally eX-tending air cells in the Walls thereof, said cells extending throughoutthe length of the Walls, there being grooves in the meeting faces of themembers, a plastic key Within the grooves for holding the memberstogether, the sections of the flue being placed one above the other, andmeans interposed between the sections for closing the ends of the cellsand for sealing the joints between the sections, said means includingprojecting portions extending into the cells, and Washers upon the'upperand lower faces of said means and engaging the adjacent ends of thesections.

In testimony that I claim the foregoing as'my own, I have hereto afiixedmy signatu re in the presence of tWo Witnesses.

. EDWIN M. CA-MPFIELD. Witnesses I. B. ARNOLD, ALICE M. sGI-IUERMAN.

copleszot this patentmay'be obtainedfor five cents each, by addressingthe Commissioner of Patents.

Washington, D. G,

